Encoding Question - print £ in c#

I have text file that I need to ingest.  It contains a sterling sign £.
When I try to print it gets converted to something else.

When writing to the file using streamwrite I tried encoding.default which displays the £ as a ?
When using UTF8 Textpad can't open it.  When I use notepad it shows another weird character.
How can I print a £?
I'm using C# with .NET framework 3.5.
This is a windows rather than a web form.
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Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
you need to save the text file as utf-8 encoding compatible.

StreamWriter Constructor (Stream, Encoding, Int32)
AlHal2Author Commented:
I'm using the syntax below and am getting the message that the text file contains characters that do not exist in the code page 1252 (ANSI - :LATIN I).  They will be converted to the system default character, if you click OK.
Sure enough the £ gets converted to a ?

StreamWriter sWriter = new StreamWriter(s_m_log_file_name,false,System .Text .Encoding.UTF8,512  );
        IEnumerator itor = v_p_m_messages.GetEnumerator();

        while (itor.MoveNext())

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AlHal2Author Commented:
When I save the input file as UTF8 I get an extra  next to the £
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AlHal2Author Commented:
However the output file comes out OK!
is this what you would expect?
Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
yes, this is the exactly what I mentioned.

>>StreamWriter sWriter = new StreamWriter(s_m_log_file_name,false,System.Text.Encoding.UTF8,512  );

I tested locally, it works for me as well.
private void button1_Click(object sender, EventArgs e)
            string fileName = txtPath.Text + "\\test.txt";
            string textToAdd = txtContent.Text;
            FileStream fs = null;
                if (System.IO.File.Exists(fileName))
                fs = new FileStream(fileName, FileMode.CreateNew);
                using (StreamWriter writer = new StreamWriter(fs, Encoding.UTF8, 512))
                MessageBox.Show("Done!", "ok", MessageBoxButtons.OK);
                if (fs != null)

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AlHal2Author Commented:
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